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Patented Dec. 1 3, 1892.

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UNTTE TATEs PATENT OFFICE.

EUGENE W. APPLEGATE, OF OMAHA, NEBRASKA, ASSIGNOR TO THE APPLE- GATE ELECTRIC LIGHT AND POWER COMPANY, OF CHICAGO, ILLINOIS.

INCAN DESCENT LAM P.

SPECIFICATION forming part of Letters Patent No. 488,139, dated December 13, 1892.

Application filed April 7, 1892. Serial No. 428.139. (N0 model.)

To all whom it may concern:

Be it known that I, EUGENE W. APPLEGATE, of Omaha, in the county of Douglas and-State of Nebraska, have invented certain new and useful Improvements in Incandescent Lamps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make an use the same.

This invention contemplates certain new and highly-useful improvements in incandescent lamps, and has for its object, primarily, the production of an improved lamp of this character capable of having its filaments readily and easily replaced when necessary, and to provide cheap and highly-efficient leading-in wires.

A further object is to provide an improved incandescent lamp from which the air can be exhausted at the neck of the bulb thereof.

A further object is to provide an incandescent lamp with an improved support for the leading-in wires, which support is hermetically sealed and which can be removed when the filaments are to be replaced.

This invention comprises an incandescent lamp having the peculiar novel construction, combination, and arrangement of parts, substantially as hereinafter fully set forth, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical sectional view of an incandescent lamp constructed in accordance with my invention, the socket and bulb being shown disconnected. Figs. 2 and 3 are vertical sectional views showing slightly-modified connections between the lamp-neck and the cap or plug for the leading-in wires.

Referring to the drawings, A designates a glass bulb provided at its upper end with a cylindrical neck a, at the lower end of the inner portion of which is formed a peripheral flange or shoulder a, the glass being thickened at these points. 011 the outer surface of the neck a is a bead a Bis a cap or plug of cylindrical form, having an upper thickened end or head I), designed to fit snug upon the peripheral flange or shoulder a and be supported thereby. This cap or plug is made of lava and is thoroughly D isa vertical tube extended throughacentral opening in the cap or plug B,'its lowerinner ends being coincident with the inner face of said cap or plug and its out-erend projected beyond the head thereof. Through the agency of this tube air can be exhausted from the interior of the bulb. The upper end of said tube is sealed to the glass tube of a vacuumpump, (not shown,) and after the air is extracted from the bulb the end of said tube D is sealed. The upper concaved face of the head of cap or plug B is covered with glass to seal all openings, and around, the beveled edge of said head is placed soft glass that will fuse at not more than 1,000 of heat,thus practically making all one piece when sealed and permitting of the removal of said cap or plug when necessary.

The carbon filament E has its ends connected by suitable clamps-such as shown at e to the inner ends of the leading-in wires.

F designates the socket, which I have found it advantageous to make of papier-mach. This socket is of cylindrical form and is provided with a lower spring-collar f, extending beyond its lower edge and designed to engage the bead a on the neck of the lamp. From a cross-piece or partition f in this socket extend spring-arms f f the latter being connected with one of the circuit-wires 0:, passed in through the top of the socket. The springarm f is in connection with a spring f with which and a similar spring f connected with circuit-wire as, is designed to engage the oval end of a key f by means of which the circuit can be completed. The lower endsof the spring-arms f are in contact with electrodes b when the socket is properly positioned.

While the preferred form of supporting the cap or plug is as above described, yet I do not limit myself thereto, since other forms of connection between such cap or plug and the neck of the bulb may be employed without departing from the spirit of my invention.

In Fig. 2 the bulb is shown as provided with an outer peripheral flange g at the base of its neck, which latter is exteriorly screwthreaded. The cap or plug B is provided with an outer depending flange g", having on its inner surface a screw-thread engaging that of the neck and resting at its lower end upon flange 9. Suitable soft glass or asbestus cement is placed around this flange to prevent the entrance of air between the latter and the cap or plug.

A second modification is shown in Fig. 3, wherein the lava capor plug is shown as having its lower flange h resting upon and partially inclosing the upper end of the neck of the lampbulb. Asbestus or other suitable packing h is placed between the cylindrical portion of the cap or plug and the neck of the lamp and soft glass or cement is placed between thedepending portion of the flange h and said neck to further seal the same.

The advantages of my invention are apparent to those skilled in the art to whichit ap pertains, and it will be specially observed that thereis a great savingin the cost of these lamps by being able to replace the worn or utilized carbon filaments, and the usefulness or servr iceability of the lamp is materially enhanced; also, that by making the cap or plug of lava an inexpensive and highly-durable article is obtained, and said cap or plug is supported by and removably secured to the neck of the bulb and held by adhesives, which render the sealing hermetic. In the employment of leading-in Wires of aluminium there is still further saving in the cost of manufacture, and wires of this material are equally as efficacious as those made of platinum now in general use.

Another highly-important advantage lies in the ability to exhaust the air from the lamp through the tube in the neck of the bulb.

I claim as my invention 1. The herein-described improved incandescent lamp, comprising the bulb, the cap or plug having a lower cylindrical portion and an upper widened end supported by the neck of said bulb and hermetically connected thereto, the leading-in wires formed of aluminium, extended through said cylindrical portion of said cap or plug, and the vertical air-exhaust tube or opening leading centrally through said cylindrical portion of the cap or plug, substantially as set forth.

2. The herein-described improved incandescent lamp, comprising the bulb, the lava cap or plug having a cylindrical portion and upper widened end supported by said bulb, the leading-in wires of aluminium, extended through said cap or plug, the carbon filament connected at its ends to said leading-in wires, the Vertical exhaust-tube leading centrally through said cylindrical portion of said cap or plug, the socket removably secured to said cap or plug and having circuit-wires extending therein, and the connection between the latter and said leading-in wires,substantially as set forth.

3. The herein-described improved incandescent lamp, comprising the bulb provided at its neck with an inner peripheral flange, a cap or plug having a head at its upper end resting on said flange, the leading-in wires extended through said cap or plug, the carbon filament connected at its ends to said leading-in wires, the electrodes over the upper ends of said leading-in Wires, the removable socket having the circuit-wires extending thereinto, the plates designed to engage said electrodes, and the key, substantially as set forth.

4. The herein-described improved incandescent lamp, comprising the bulb provided atitsneckwithaperipheral flange,aeaporplug of lava, having ahead rest-ing on said flange, the air-exhaust tube extending through said cap or plug, the leading-in wires having electrodes over their upper ends, a covering around said electrodes, the removable socket of papier-mach having a cross-bar therein, the spring-plates extending from said crossbar to said electrodes, the circuit-wires one of which is connected directly to one of said spring-plates, and the key designed to form connection between the other circuit-wire and spring-plate, substantially as set forth- In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

EUGENE W. APPLEGATE.

Witnesses:

WILLIAM J. LLOYD, EDWARD M. MULFORD, Jr. 

